MESON Chess Problem Database

Problem Display
PID: 18769 (4Qn1B/1r1r4/5NPk/5p2/5N1K/8/b7/8 w - - 0 1)

Rice, John Michael

Correspondence Chess, 1958

4Qn1B/1r1r4/5NPk/5p2/5N1K/8/b7/8

#2

6 + 6

3174 The Two-move Chess Problem Tradition and Development 1966
5174 Chess Problem Spectrum 2003

SOLUTION

  • SOUND
  • Sets
    • 1...Rb3
      • 2.Sg8#
    • 1...Rd5
      • 2.Sg8#
    • 1...Rf7
      • 2.Sg8#
    • 1...Bb1
      • 2.Sg8#
    • 1...Bf7
      • 2.Qxf8#
    • 1...Bg8
      • 2.Sxg8#
    • 1...Se6
      • 2.Sg8#
    • 1...Sxg6+
      • 2.Qxg6#
  • Tries
    • 1.Qf7?
      • threat
        • 2.Sg8#
        • 2.Bg7#
      • 1...Sxg6+
        • 2.Qxg6#
      • 1...Rxf7
        • 2.Sg8#
      • 1...Se6
        • 2.Sg8#
      • 1...Bxf7!
  • Keys
    • 1.g7!
      • threat
        • 2.Qh5#
      • 1...Sg6+
        • 2.Qxg6#
      • 1...Rf7
        • 2.g8S#
      • 1...Bf7
        • 2.gxf8Q#
        • 2.gxf8B#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 6
  • Sets
    • R(d);S_CUTB(a)::S(C)
    • R(e);S_CUTB(a)::S(C)
    • B(a);N_GUARD::S(C)
    • B(a);S_CUTR(e)::QAB(E),XS(f)
    • B(a);N_GUARD::S(C),XB(a)
    • S(f);S_CUTB(a)::S(C)
    • S(f);CHECK,OGATE,XP(D)::QAR1(E),XS(f)
  • Tries
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • S(f);CHECK,OGATE,XP(D)::QAR1(E),XS(f)
        • R(e);XQ(E)::S(C)
        • S(f);::S(C)
      • Refutation
        • B(a);XQ(E)
  • Actual
    • P(D);
    • Threat
      • QAR1(E)
    • Vars
      • S(f);CHECK,N_GUARD::QAR1(E),XS(f)
      • R(e);S_CUTB(a)::P=S
      • B(a);S_CUTR(e)::PXS(f)=Q
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